This circuit for generating precise reference signals was found in the April 1973 issue of Radio Electronics magazine. The circuit generates 100 kHz signals according to the crystal used.
This circuit uses an optocoupler with a phototriac or optotriac to drive an external triac. The...
This circuit was published in an English magazine from 1980. The magazine no longer exists, but...
This mixer configuration from a 1967 publication can be adapted to work with modern transistors. The...